MP7614

FEATURES Full Four-Quadrant Multiplication Excellent Stability Over Temperature and Time Guaranteed Monotonic TTL/5 V CMOS Compatible w w a D . w S a t e e h U 4 t m o .c MP7614 15 V CMOS Multiplying 14-Bit Digital-to-Analog Converter Low Sensitivity to Output Amplifier VOS Low Glitch Energy 16-Bit Version: MP7616 GENERAL DESCRIPTION The MP7614 is a high density 14-bit CMOS multiplying Digital-to-Analog Converter. Silicon nitride passivation and untrimmed silicon chromium resistors have been combined to provide long term stability and reliability. Using the most significant bit (MSB) segmentation technique, the MP7614 features 13-bit (0.012%) differential and 12-bit (0.01%) integral linearity. To achieve 13-bit linearity without laser trim, the MP7614 digitally decodes the four MSB’s into 15 equal current sources, rather than the standard binary-weighted sources. Each resistor contributes only 1/16 full scale output thus reducing the matching accuracy requirement of the resistor and CMOS switches from 0.0015% to 0.006%. The decoding technique achieves an eightfold improvement in differential linearity stability over temperature, an eightfold improvement in relative accuracy due to aging effects (long term stability), a fourfold improvement in glitch amplitude, and a tenfold reduction in sensitivity to output amplifier offset voltage. SIMPLIFIED BLOCK DIAGRAM VDD VREF R R R w Rev. 2.00 w .D w R R 4 R t a R S a R R e h R t e R U 4 .c m ...